According to the SRD, a Wizard's proficiencies are as follows:
Weapons: Daggers, darts, slings, quarterstaffs, light crossbows
However, the light crossbow appears to have been left off the list in Solasta. (As well as slings, but I'm not sure if those are even in the game, whereas crossbows are.)
"I saw her first. Go find your own genetic time-capsule or so help me, I'll *cut* you."